"One, two, three, four, five..."
Yan Feifan calmed his mind. With complete concentration, every time he silently counted to five, he noticed Zhang Chao's right hand twitching slightly and rapidly. The twitch was so slight that it was almost imperceptible. If his hands hadn't been so remarkably sensitive and he hadn't been mentally prepared, he really might have missed it.
The rhythmic twitching of Zhang Chao's right hand led Yan Feifan to a particular possibility.
Epilepsy!
Epilepsy was a chronic brain disease caused by a variety of factors. It was characterized by recurrent, episodic, and transient dysfunction of the central nervous system, all resulting from excessive electrical discharges by brain neurons. The exact cause of the disease remained unknown, but according to current medical research, tumors, infections, strokes, and brain injuries could all trigger it.
